Effects of key factors on solar aided methane steam reforming in porous medium thermochemical reactor

Wang, Fuqiang; Tan, Jianyu; Ma, Longhua; Liang, Yu

doi:10.1016/j.enconman.2015.06.049

Cited by 44 publications

(6 citation statements)

References 51 publications

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“…Similarly, these approaches and the improved Monte Carlo Ray Tracing method can also be used fairly to predict the radiative properties of the packed bed regarded as an equivalent homogeneous medium for both the semi-transparent particles and the opaque particles [82,89]. Once the radiative properties are obtained, the radiative heat exchange inside either the porous volumetric receiver or the pecked-bed PSRs can be computed by applying the typical simulation method of the RTE, such as the Rosseland approximation [15,23,[90][91][92][93][94], the P1 method [27,28,57,60,[95][96][97] and the discrete ordinates method [16,66,98,99]. Since the extinction coefficient of the porous materials is up to several hundred per meter (m −1 ) Once the radiative properties are obtained, the radiative heat exchange inside either the porous volumetric receiver or the pecked-bed PSRs can be computed by applying the typical simulation method of the RTE, such as the Rosseland approximation [15,23,[90][91][92][93][94], the P 1 method [27,28,57,60,[95][96][97] and the discrete ordinates method [16,66,98,99].…”

Section: Continuous Particle Modelmentioning

confidence: 99%

“…Once the radiative properties are obtained, the radiative heat exchange inside either the porous volumetric receiver or the pecked-bed PSRs can be computed by applying the typical simulation method of the RTE, such as the Rosseland approximation [15,23,[90][91][92][93][94], the P1 method [27,28,57,60,[95][96][97] and the discrete ordinates method [16,66,98,99]. Since the extinction coefficient of the porous materials is up to several hundred per meter (m −1 ) Once the radiative properties are obtained, the radiative heat exchange inside either the porous volumetric receiver or the pecked-bed PSRs can be computed by applying the typical simulation method of the RTE, such as the Rosseland approximation [15,23,[90][91][92][93][94], the P 1 method [27,28,57,60,[95][96][97] and the discrete ordinates method [16,66,98,99]. Since the extinction coefficient of the porous materials is up to several hundred per meter (m −1 ) orders, there is no difference in the results of the radiative heat exchange solved by these methods.…”

Section: Continuous Particle Modelmentioning

confidence: 99%

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A Review of Radiative Heat Transfer in Fixed-Bed Particle Solar Receivers

Dai,

Huangfu,

Wang

et al. 2023

Sustainability

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A highly efficient receiver is required because re-radiation loss increases dramatically with increased working temperature. Among a large number of receivers, the fixed-bed Particle Solar Receiver (PSR) represents a new pathway to high temperature with maximum overall thermal efficiency. The incoming solar radiation can penetrate deeper into the fixed-bed PSR filled with semi-transparent quartz and ceramic particles (spheres or Raschig rings), resulting in an increased volumetric effect. Reports show that an optimized PSR can realize overall receiver efficiency of around 92% at outlet temperatures above 1000 K, and achieve the annual temperature above 1000 K over 65% annual operating hours integrated with a concentrated solar power (CSP) system. To fully understand radiative heat transfer characteristics and provide deep insight into thermal efficiency, radiation energy is classified as incident solar radiation and radiative heat exchange in two parts. The transfer mechanism, the solution method and the progress of the investigation for each section are summarized and discussed in detail. Then, challenges and future directions, including an innovative design method, an improved experimental approach and an effective simulation method are proposed to put forward this receiver to be a preferred substitute in advanced, high-temperature power cycles.

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Section: Continuous Particle Modelmentioning

confidence: 99%

Section: Continuous Particle Modelmentioning

confidence: 99%

A Review of Radiative Heat Transfer in Fixed-Bed Particle Solar Receivers

Dai,

Huangfu,

Wang

et al. 2023

Sustainability

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“…There is growing interest in hydrogen as a promising energy carrier, because of its high calorific value and pollution-free character as fuel. [1] One of the synthesis routes of hydrogen production is steam reforming using natural gas, alcohols, biogas, etc. as feedstock.…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Solar-driven Biogas Steam Reforming in a Membrane Reactor

2020

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A prototype for a low temperature solar-driven biogas steam reforming process was designed by coupling a hydrogen selective membrane reactor and linear Fresnel collector technology. To verify the prototype, the membrane reactor model was established by using ASPEN Plus and was studied using a modelled biogas in the temperature range 450 to 500oC. The methane conversion was significantly enhanced by applying the H2 selective membrane. Based on the actual Direct Normal Irradiation in South Africa, the capability of linear Fresnel collector was verified for the required heat duty in this study, which varying from 90.1 to 366.4 kW/m2. This novel work constitutes a reference study for new developments with reactor designs and solar energy application in biogas steam reforming processes.

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“…However, elemental hydrogen is not found on earth and must be chemically separated from one of its compounds such as water or methane. Commercially, methane steam reforming (MSR) is used to convert fossil methane to hydrogen gas and carbon monoxide (as syngas) at high temperature, providing over half of global hydrogen production. − The reaction is endergonic and endothermic, requiring high energy input at high temperature. − Together with MSR, the water-gas shift (WGS) reaction takes places, where carbon monoxide reacts with water to form carbon dioxide and hydrogen. …”

Section: Introductionmentioning

confidence: 99%

Density Functional Theory Investigation of the Role of Cocatalytic Water in Methane Steam Reforming over Anatase TiO₂ (101)

Hook

Nuber

Celik

2018

Ind. Eng. Chem. Res.

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The methane steam reforming (MSR) mechanism on the anatase TiO2 (101) surface has been investigated using periodic density functional theory. Reaction energies for several pathways were calculated, and pathways involving high energy intermediates were eliminated from consideration. The remaining pathways all involved formaldehyde and formyl as intermediates. Activation energy barriers were calculated for these, revealing that C–H activation in methane and elementary dehydrogenation reactions in general involved very high energy transition states when calculated on clean surfaces. When water was coadsorbed on reaction surfaces as chemisorbed OH and H, hydrogen transfer reactions were facilitated by the proximity between hydrogen donor and acceptor and the strong affinity of hydroxyl for hydrogen. As the product of such hydrogen transfer reactions was physisorbed water, water activation completes the catalytic cycle, and the role of water can be termed cocatalytic. Cocatalytic water lowered the most difficult dehydrogenation barriers by 2–3 eV, including reducing the methane activation barrier from 4.96 to 2.95 eV, making activity on the TiO2 surface relevant at high MSR reaction temperatures. Because of the high barrier for CHO dehydrogenation, the water-gas shift reaction is expected to make CO2 the preferred product, rather than CO, during MSR over metal-free TiO2.

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Effects of key factors on solar aided methane steam reforming in porous medium thermochemical reactor

Cited by 44 publications

References 51 publications

A Review of Radiative Heat Transfer in Fixed-Bed Particle Solar Receivers

A Review of Radiative Heat Transfer in Fixed-Bed Particle Solar Receivers

Low Temperature Solar-driven Biogas Steam Reforming in a Membrane Reactor

Density Functional Theory Investigation of the Role of Cocatalytic Water in Methane Steam Reforming over Anatase TiO₂ (101)

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Effects of key factors on solar aided methane steam reforming in porous medium thermochemical reactor

Cited by 44 publications

References 51 publications

A Review of Radiative Heat Transfer in Fixed-Bed Particle Solar Receivers

A Review of Radiative Heat Transfer in Fixed-Bed Particle Solar Receivers

Low Temperature Solar-driven Biogas Steam Reforming in a Membrane Reactor

Density Functional Theory Investigation of the Role of Cocatalytic Water in Methane Steam Reforming over Anatase TiO2 (101)

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Density Functional Theory Investigation of the Role of Cocatalytic Water in Methane Steam Reforming over Anatase TiO₂ (101)